found fix

config.def.h

@@ -103,7 +103,7 @@ static const Layout layouts[] = {
 #define SHCMD(cmd) { .v = (const char*[]){ "/bin/sh", "-c", cmd, NULL } }
 
 /* commands */
-static const char *termcmd[]  = {"st zsh", NULL};
+static const char *termcmd[]  = {TERMINAL, NULL};
 
 /*
  * Xresources preferences to load at startup